Run following commands to enable your Raspberry Pi.
Now you will be able to navigate Korean website like NAVER, DAUM, and etc.
In addition, you will need to run below command for using your Hangul key.
And please follow following procedure to activate all the necessary things:
Raspberry Pi → Preference → Input Method → Click Okay → Click Yes → Select "fcitx" and click OK → OK
Now what you have to do is just rebooting on command line